Final answer:
If an electron is released from rest at point A where the electric field lines are directed positively, it will accelerate towards the positive direction due to its negative charge. In a uniform field, it will continue through a hole in the positive plate without being pulled back, due to its acquired kinetic energy and lack of force acting on it beyond the hole.
Step-by-step explanation:
If an electron is released from rest at point A in a region where electric field lines are shown, its behavior will depend on the direction of the electric field lines at that point. Electrons are negatively charged particles and will move in the direction opposite to the electric field lines. Therefore, if the field lines are directed from the positive to the negative direction, the electron will accelerate towards the positive direction.
In a uniform electric field, such as the field between two oppositely charged parallel plates, an electron released near the negative plate will be accelerated towards the positive plate. If there's a hole in the positive plate, the electron will continue to move through it without being pulled back due to its acquired kinetic energy and inertia. The electric force acting on the electron will cease once it passes through the hole, as there's no longer an electric field exerting a force on it.